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Physics Homework Help

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The predominant frequency of a certain fire truck's siren is 1700 Hz when at rest.

Part A What frequency do you detect if you move with a speed of 24.5 m/s toward the fire truck?

Part B What frequency do you detect if you move with a speed of 24.5 m/s away from the fire truck?
asked Nov 28, 2015 in PHYSICS by anonymous

2 Answers

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The predominant frequency of a certain fire truck's siren is image Hz.

A)

Listener is moving with a speed of image m/s.

Speed of the sound is image m/s.

Listener is moving towards fire truck which is at rest.

From the Doppler effect, frequency detected by the listener moving toward the source is image.

Substitute corresponding values in the formula.

image

Frequency detected by the listener is image Hz.

answered Nov 28, 2015 by cameron Mentor
0 votes

The predominant frequency of a certain fire trucks siren is Hz.

B)

Listener is moving with a speed of m/s.

Speed of the sound is m/s.

Listener is moving away from fire truck which is at rest.

From the Doppler effect, frequency detected by the listener moving away from the source  is image.

Substitute corresponding values in the formula.

image

Frequency detected by the listener is image Hz.

answered Nov 28, 2015 by cameron Mentor

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